Hi! I'm experiencing what seems to be the same issue: I did a Debian testing dist-upgrade (it's been several weeks), rebooted, accidentally logged in with a "regular" GNOME session, logged out, logged in again with a "flashback" session (which I'm normally using), and now the panel at the bottom is solid black.
Trying to re-add the regular widgets to it (workspace switcher, and so on), just nothing happens. Removing the bottom panel and then re-creating it also doesn't help. Reverting to an earlier version of gnome-panel and gnome-panel-data (for example, 3.4.2.1-6) doesn't help. Removing GNOME's dot-files in $HOME and having them be re-created upon the next login doesn't help. Adding widgets to the top panel works fine. Grüße, Thomas
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